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2. Conoscopic interference pattern - Wikipedia

   en.wikipedia.org/wiki/Conoscopic_interference...

   The point where the isogyres is most tightly curved represents the position of each of the two optic axes present for a biaxial mineral, and thus the maximum separation between the two curves is diagnostic of the angle between the two optic axes for the mineral. This angle is called the optic angle and often notated as "2V". In some cases ...

3. Topaz - Wikipedia

   en.wikipedia.org/wiki/Topaz

   Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2. ... The 2V optical angle in topaz can range from 48° to 69 ...

4. Angle of incidence (optics) - Wikipedia

   en.wikipedia.org/wiki/Angle_of_incidence_(optics)

   The angle of incidence, in geometric optics, is the angle between a ray incident on a surface and the line perpendicular (at 90 degree angle) to the surface at the point of incidence, called the normal. The ray can be formed by any waves, such as optical, acoustic, microwave, and X-ray. In the figure below, the line representing a ray makes an ...

5. 2V - Wikipedia

   en.wikipedia.org/wiki/2V

   2V or 2-V may refer to: 2V, IATA code for Amtrak; 2V angle, curved isogyre differences in a conoscopic interference pattern in optical crystallography; P-2V, a model of Lockheed P-2 Neptune; An-2V, a model of Antonov An-2; 2V (V-69), manufacturer's designation for Venera 5 spacecraft; 2VLY, call sign for Power FM 98.1

6. Autocollimator - Wikipedia

   en.wikipedia.org/wiki/Autocollimator

   An autocollimator is an optical instrument for non-contact measurement of angles. They are typically used to align components and measure deflections in optical or mechanical systems. An autocollimator works by projecting an image onto a target mirror and measuring the deflection of the returned image against a scale, either visually or by ...

7. Ellipsometry - Wikipedia

   en.wikipedia.org/wiki/Ellipsometry

   The angle of incidence is chosen close to the Brewster angle of the sample to ensure a maximal difference in and . [5] Ellipsometry measures the complex reflectance ratio ρ {\displaystyle \rho } (a complex quantity), which is the ratio of r p {\displaystyle r_{p}} over r s {\displaystyle r_{s}} :

8. List of measuring instruments - Wikipedia

   en.wikipedia.org/wiki/List_of_measuring_instruments

   Luminance meter for measuring luminance, i.e. luminous flux per unit area and unit solid angle; Light meter, an instrument used to set photographic exposures. It can be either a lux meter (incident-light meter) or a luminance meter (reflected-light meter), and is calibrated in photographic units.

9. Waveguide (optics) - Wikipedia

   en.wikipedia.org/wiki/Waveguide_(optics)

   An optical waveguide is a physical structure that guides electromagnetic waves in the optical spectrum.Common types of optical waveguides include optical fiber waveguides, transparent dielectric waveguides made of plastic and glass, liquid light guides, and liquid waveguides.